Microwave Spectrum of Allyl Alcohol

Abstract

The microwave spectrum of allyl alcohol has been investigated in the frequency range 8–35 Gc/sec, for the normal sample (CH2CHCH2OH), deuterated sample (CH2CHCH2OD), and 18O‐substituted sample (CH2CHCH2 18OH). For the normal sample, 20 transitions, which can be attributed to rotational absorption by a gauche form of the molecule, are reported both for the ground vibrational state and the first excited vibrational state. The rotational constants of the deuterated sample and 18O‐substituted sample indicate the assigned conformation is the gauche form which allows an H bond between the π electrons and the OH group. The molecular‐dipole‐moment components have been determined from the Stark‐effect measurements, |μ a |=1.41±0.02 D, |μ b |=0+0.07 D, |μ c |=0.65±0.01 D, and μtot=1.55±0.04 D.